基于核磁共振技术及熵理论探究水泥砂浆早期水化特征

doi:10.11896/cldb.25030246

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Abstract The early hydration process and pore water distribution characteristics of cement mortar were investigated by using Nuclear Magnetic Resonance (NMR) and entropy theory. T₂ spectrum, obtained by NMR, was used to explain the hydration degree and rate of the cement mortar, and based on Shannon entropy, the intrinsic relationship between the pore water distribution entropy(PDE) and the hydration degree and rate was deeply analyzed. The results show that significant changes in T₂ occur between 4 h and 10 h. The amount of interlayer and gel pore water (IGW) decreases before 4.0 h due to limited input from capillary water (CW), while increases significantly due to substantial contributions from CW. With the extension of hydration time, the pore size distribution entropy (PDE) exhibits an inverted S-shaped pattern characterized by a slight initial increase followed by a rapid decrease, then follows by another rapid increase before stabilizing. The pore water distribution undergoes a chaotic-order-chaotic-stable development process. There are two boundary points for PDE changes corresponding to IG and C, namely 4 h and 10 h. Within the first 4 h, IGW entropy decreases while CW entropy increases, and then IGW entropy increases rapidly while CW entropy decreases correspondingly. Additionally, the moment when the PDE is reduced to be close to the initial value or 1.5 to 2 hours before the minimum value can be identified as the initiation of the acceleration hydration stage. Similarly, a dividing point for the deceleration stage can be determined where the PDE value changes from fast to slow. This work may offer theoretical underpinnings and technical guidance for the exploration of novel high-performance cementitious materials.

Key words： pore water distribution entropy (PDE) nuclear magnetic resonance (NMR) hydration characteristics cement mortar

Received: 10 May 2026 Published: Online: 2026-05-18

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TU528.0

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	Articles by authors
	JI Xuan
	FU Liang
	NING Lin
	BI Jing

Cite this article:

JI Xuan,FU Liang,NING Lin, et al. Investigation on the Early Hydration Characteristics of Cement Mortar ThroughEntropy Theory and NMR Technology[J]. Materials Reports, 2026, 40(9): 25030246-8.

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https://www.mater-rep.com/EN/10.11896/cldb.25030246 OR https://www.mater-rep.com/EN/Y2026/V40/I9/25030246

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